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' Sequoia 680 Chesa take Drivc Redwood Cr CA 94063 <br /> a tY (650) 364 9600 FAX (650)364 9233 <br /> a, 404 N W get Lane Walnut Creek CA 94598 (510) 988 9600 FAX (510) 988 9673 <br /> 111w Analytical 815 StrekcrAvenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916)921 0100 <br /> E A Engineering Science &Tech Client Project ID Exxon 7-0137, 51501 37 1300 <br /> 3468 Mt Diablo Blvd , Ste B-100 Matrix Liquid <br /> Lafayette, CA 94549 <br /> Attention Chnsta Marting Work Order# 9710816 05 Reported Oct 27, 1997 <br />' QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br />' Benzene <br /> QC Batch# GC102297STEX02A GC102297BTEX02A GC102297STEX02A GC1022976TEX02A GC102297STEX02A <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8015M <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br />' Analyst A. Miraftab A Mirattab A Mivaftab A Miraftab A Miraftab <br /> MS/MSD # 971085101 971085101 971085101 971085101 971085101 <br />' Sample Conc ND N D N D N D ND <br /> Prepared Date 10/22/97 10/22/97 10/22/97 10/22/97 10/22/97 <br /> Analyzed Date 10/22/97 10/22/97 10/22/97 10/22/97 10/22/97 <br /> Instrument I D# GCHP2 GCHP2 GCHP2 GCHP2 GCHP2 <br />' Conc Spiked 10{ig/L 10ug/L 10yg/L 30pg/L 60yg/L <br /> Result 90 86 86 32 52 <br /> MS % Recovery 90 ss as 89 87 <br /> Dup Result 10 95 96 35 56 <br /> MSD % Recov 100 85 95 99 93 <br />' RPD 11 99 11 90 74 <br /> RPD Unlit 0-25 0-25 0-25 0-25 0-25 <br /> LCS# BLK102297 BLK102297 BLK102297 BLK102297 81-1<102297 <br />' Prepared Date 10/22/97 10/22/97 10/22/97 10/22/97 10/22/97 <br /> Analyzed Date 10/22/97 10/22/97 10/22/97 10/22/97 10/22/97 <br /> Instrument I D # GCHP2 GCHP2 GCHP2 GCHP2 GCHP2 <br />' Conc Spiked 10ug/L 10ug/L 10pg/L 30Ng/L 60pg/L <br /> LCS Result 92 88 90 27 60 <br />' LCS % Recov 92 88 90 90 100 <br /> 60-140 60-140 60-140 60-140 60-140 <br /> LCS 70-130 70-130 70-130 70-130 70-130 <br /> Control Limits <br />' Please Note <br /> The LCS is a control sample of known,interferent-free matrix that is analyzed using the same reagents <br /> SEQUOIA ANALYTICAL preparation,and analytical methods employed for the samples The matrix spike is an aliquot of sample <br /> fortified with known quantities of specific compounds and subjected to the entire analytical procedure if <br /> the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> Vei,eh rd Herl <br /> interference the LCS recovery is to be used to validate the batch <br /> �in <br /> Project Manager **MS=Matrix Spike, MSD-MS Duplicate, RPD=Relative%Difference 9710816 EEE <4> <br />